Another Dumb Headset Question
 

Because a certain retailer in the UK current has an incredible deal on RockShox forks and is including a free headset, I thought I might throw some cash into my much abused Trek.

It's a 2005 Trek 3700 , and the headset is completely shot after ~2,000 miles commuting and being used as a city bike without much maintenance. My question is whether a headset like this could replace the semi-integrated headset that's currently in there.

Semi integrated? define your terms .

and I'm the one asking you for advice! ;)

Honestly, my knowledge of bike maintenance doesn't extend far past the drivetrain, brakes, and shifters. Bottom Brackets, Forks, and Headsets are the things I don't touch unless absolutely necessary, and then it's usually just to take it to the shop.